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 A052221 Numbers whose sum of digits is 7. 34

%I

%S 7,16,25,34,43,52,61,70,106,115,124,133,142,151,160,205,214,223,232,

%T 241,250,304,313,322,331,340,403,412,421,430,502,511,520,601,610,700,

%U 1006,1015,1024,1033,1042,1051,1060,1105,1114,1123,1132,1141,1150,1204

%N Numbers whose sum of digits is 7.

%C A007953(a(n)) = 7; number of repdigits = #{7,1111111} = A242627(7) = 2. - _Reinhard Zumkeller_, Jul 17 2014

%H Vincenzo Librandi, <a href="/A052221/b052221.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Range[1500],Total[IntegerDigits[#]]==7&] (* _Harvey P. Dale_, Apr 11 2012 *)

%o (MAGMA) [n: n in [1..1500] | &+Intseq(n) eq 7 ]; // _Vincenzo Librandi_, Mar 08 2013

%o a052221 n = a052221_list !! (n-1)

%o a052221_list = filter ((== 7) . a007953) [0..]

%o -- _Reinhard Zumkeller_, Jul 17 2014

%Y Cf. A007953.

%Y Cf. A011557 (1), A052216 (2), A052217 (3), A052218 (4), A052219 (5), A052220 (6), A052222 (8), A052223 (9), A052224 (10), A166311 (11), A235151 (12), A143164 (13), A235225(14), A235226 (15), A235227 (16), A166370 (17), A235228 (18), A166459 (19), A235229 (20).

%Y A242614, A242627.

%K nonn,base,easy

%O 1,1

%A _Henry Bottomley_, Feb 01 2000

%E Offset changed from _Bruno Berselli_, Mar 07 2013

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Last modified December 15 01:20 EST 2018. Contains 318141 sequences. (Running on oeis4.)